Single-chip mixer-based subarray beamformer for sub-Nyquist sampling in ultrasound imaging. (26th April 2021)

• Record Type: Journal Article
• Authors: Kanemoto, Daisuke; Spaulding, Jonathon; Murmann, Boris
• Is Part Of: Japanese journal of applied physics. Volume 60:Number SB(2021)
• Publication Date: 2021-04-26
• Subjects: Ultrasound imaging -- Compressed Sensing -- Beamformer -- Integrated Circuit; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/abec8b
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Compressed sensing (CS) has been proposed as a method of breaking the seemingly inherent tradeoff between sampling rate and resolution in a variety of applications, such as ultrasound imaging. Although various studies have demonstrated the effectiveness of using CS for sub-Nyquist sampling in ultrasound imaging, a dedicated integrated circuit (IC) has not yet been presented. This work introduces a single-chip mixer-based subarray beamformer, an important component for sub-Nyquist sampling in a CS ultrasound imaging system. The beamformer chip, which performs mixing, filtering, and summation of delayed signals within a subarray, is implemented using a single operational transconductance amplifier. We evaluated the performance of the proposed mixer-based subarray beamformer circuit fabricated using a 65 nm CMOS process with 0.4 mW ch −1 power consumption from a 1.2 V supply. Measurement results indicate that the prototype chip is suitable for subarray beamforming with a 5 ns resolution digital mixing sequence. The IC presented here is the first known implementation of a mixer-based subarray beamformer for sub-Nyquist sampling in ultrasonic applications and is expected to reduce sampling data requirements by a factor of 32.